Vikings Ponder’s sore knee is improving

Vikings quarterback Christian Ponder developed a knee problem this week. As the team prepares to attempt to stretch its record to 4-1 against the Titans, Ponder’s knee is improving. “It didn’t bother him very much on Monday, but it was really sore Wednesday,” Frazier said Thursday, via ESPN1500.com. “It was much better today. He didn’t…